Chemical Thermodynamics Question 495

Question: Calculate $ \Delta H^{o} $ for evaporation of $ H_2O(l) $

$ H_2+\frac{1}{2}O_2\xrightarrow{,},H_2O(l);\Delta H=285.77kJ $ -(i) $ H_2+\frac{1}{2}O_2\xrightarrow{,},H_2O(g);,\Delta H=241.84kJ $ -(ii)

Options:

A) + 43.93 kJ

B) - 43.93 kJ

C) 527.61 kJ

D) - 527.61 kJ

Show Answer

Answer:

Correct Answer: B

Solution:

  • Subtract Eq. (i) from (ii) to get $ H_2O,(l)\xrightarrow{,},H_2O,(g) $

$ -,285.77+241.84=-43.93 $



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